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(11) | EP 0 300 702 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Compression test machine |
(57) A stabilisation and gripping device for use with a compression test machine to measure
strain vs load characteristics of, in partricular composite material uni-directional
ply, specimens includes a guide sleeve (1), two hollow open ended end-blocks (2) adapted
to slidably fit within the guide sleeve and to co-operate with parts of the machine
for applying compressive forces to the specimen, and two pairs of collets (6) each
pair for gripping a separate one of two ends of the specimen (9), said collets having
a planar gripping inner surface (7), at least one outer surface tapered with respect
to said gripping surface and corresponding to a tapered inner surface of said end
blocks, and a planar outer surface for co-operation with a substantially planar inner
surface of said end blocks so that said collets may be non-rotatably inserted in said
end blocks in a position in which the respective inner surfaces are parallel and pairs
of said inner surfaces define a location for the specimen ends. |